Feb. 12, 2024, 5:43 a.m. | Kaiwen Gui Alexander M. Dalzell Alessandro Achille Martin Suchara Frederic T. Chong

cs.LG updates on arXiv.org arxiv.org

We propose a novel deterministic method for preparing arbitrary quantum states. When our protocol is compiled into CNOT and arbitrary single-qubit gates, it prepares an $N$-dimensional state in depth $O(\log(N))$ and spacetime allocation (a metric that accounts for the fact that oftentimes some ancilla qubits need not be active for the entire circuit) $O(N)$, which are both optimal. When compiled into the $\{\mathrm{H,S,T,CNOT}\}$ gate set, we show that it requires asymptotically fewer quantum resources than previous methods. Specifically, it prepares …

applications cs.cc cs.lg gates low novel protocol quant-ph quantum qubit qubits state

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